Create an ultra-high-definition, 3D-rendered image of an anthropomorphic ninja character, dressed in a shako and firefighting gear, with a dipstick tail and neurochip, holding an epee. The character should be posed in a dynamic, full-body action stance within an underwater deep-sea laboratory setting. Incorporate symmetrical composition and a shallow depth of field to emphasize the subject. The image should be inspired by the art style of David B. Mattingly and rendered using Unreal Engine 5.